. >>> developing news out of syria tonight, concerns are growing that president bashar al assad may unleash chemical weapons on his own people. earlier today secretary of state hillary clinton held talks with russia's foreign minister and the u.n. peace envoy to syria. russia and the united states have been at odds over how to resolve the conflict with syria, but the talks indicate moscow might now be changing its position. >> we have been trying hard to work with russia to stop the bloodshed in syria and start a political transition toward a post assad syrian future. >> senior u.s. officials tell fox news syrian technicians have fully mixed an unknown quantity of the deadly nerve agent sarin and loaded it onto what officials believe are to be breakable canisters that can be dropped from above. if syria were to drop these chemical bombs, thousands of people would die within minutes. >>> software mogul john mcafee is in the hospital tonight after going into convulsions and suffering two apparent heart attacks. it happened just hours after guatemalan officials rejected his bid for asylum. mca